Abrading block



Feb. 13, 1934. H. WURFSCHMIDTV ABBADING BLOCK Filed July 30, 1930 Patented Pet). F13, 1934 UNITED, STATES;-

ABRADING BLOCK Hugo Wurfschmidt, New York, N. Y,, assignor to John G. Elbs, Rochester, N. Y.

Application July 30, 1930. Serial No."471,649

' 6 Claims, (01. 51-187) V The object of my invention is to provide a block of this class which will readily hold a reserve supply of abrasive mounted on sheet material, and permitv new abrasive surfaces to be presented from time to time as the old becomes used up. This and other objects are accomplished by my invention, one embodiment of which is hereinafter more particularly set forth.

For a more detailed description of my invention, reference is to be had to the accompanying drawing, forming a part hereof, in which Figure 1' is a side elevation of my improved abrading block; 1

Figure 2 is a plan view of the same;

Figure 3 is a sectional view taken on the line 3-3 of Figure l; v

Figure 4 shows a roll suitable for insertion in the tool; and

Figure 5 shows this rollinserted 'in the reverse manner from that of Figure 1.

Throughout the various views of the drawing, similar reference characters designate similar parts.

My improved abrasive tool consists of a block 1 in which and on which-is mounted a roll 2 of abrasive material, which will be held in place in a manner described below.

The block 1 is preferably shaped substantially as shown, that is, it is given a wedge shape with a curved upper surface 3, a fiat lower surface i, which may be covered by a cushioning substanee such as felt 5, which is extended over the point 6 of the block 3.. This tool also carries two pivoted clamps 7 and 8, each of which is provided with teeth a adapted to enter corresponding perforations, to hold the strip 2 in place as indicated. For convenience, the block 1 is recessed at a convenient location as indicated at 10 to form finger rests which help in the manipulation of the tool.

The roll 2 is placed in a circular opening 11 in the block 1, and at the rear there is in this block a slot 12 through which the abrasive material 2 is passed. When in the position shown in Figure 1, this material engages shoulders 13 and 14 and when in the position shown in Figure- 5, this material engages shoulders 15 and 14, the engagement depending upon the way in which the-roll 2 is put into the block 1. In any event, when the roll 2 is put in position and the sealing expands, it rubs against the walls-of the opening 11 so as to hold itself in place and prevent turnblock. strip 16 removed; it at once expands, and when it tioned, thereby getting a double bend which holds the material tight near the clamp 8, so that this clamp may be dispensed with, if desired, although it,is preferable to employ it. Thematerial is brought over the point 6 and up and under the holder 7 which is brought down as indicated so that the strip is held tight. After the strip has become worn through use or other- ,wise, and is no longer in prime condition, the

holders 7; and 8 may be released and thereby a new length of strip 2 is drawn and put in place,

the old is severed and the holders are readjusted. While I have shown and described one embodiment of my invention, it is obvious that it is not restrictedthereto but'that it is broad enough to cover all structures that come within the scope of the annexed claims.

7 Having thus described myclaim-isz.

1. An abrading tool consisting of, a wedgeshaped wooden block having e longated fingerengaging depressions-formed in its opposite side faces, a substantially knife-edge terminal at one of its ends and a'fiat surface at its other end, the top of the blockbeing formed with a curved 0 surface from its knife-edge terminal to the hat invention, what I.

4 other end, a cylindrical opening extending transversely through the block near-the fiat end thereon, a roll of abrasive tape located in said opening and held therein by. its natural tendency toss unwind, a slot extending from the opening and through the flat end of the block, said slot being formed with relatively sharp edges at its inner and outer ends, with tape drawn from the roll and passed through the slot extending angularly over several of said edges so that inadvertent shifting of the tape through the slot is prevented by the frictionalengagement'of the tape with the edges, a' U-shaped clamp having legs pivoted to the sides of the block adjacent the knife-edge terminal thereon, said clamp having a toothed cross bar connecting its legs and adapted to overlie the top of the block and clamp a portion of the tape against the same, and an other similar clamp pivoted to the sides of the block above the slot therein, the toothed crossbar on the last-mentionedclamp being adapted to engage a part of the tapebelow the slot and hold it'against the flat surface on the end of the 2. An abrading tool consisting of, a wedge- .shaped block provided with finger-engaging recesses formed in its side faces, said block havinga substantially knife-edge-terminal at one 7 of its ends and a flat surface at its other end,

an opening extending transversely through the bi ck adjacent to the flat end surface thereon, a roll of abrasive tape located within the opening and held therein by the natural tendency o. the roll to unwind, a substantially wide slot leading from the opening to the flat end surface of the block, the opposite ends of the slot being formed with relatively sharp edges with the tape drawn from the roll and passed through the slot extending over several of said sharp edges whereby inadvertent shifting of the tape through the slot is prevented by the frictional engagement of said edges with the tape, said tape extending over the knife-edge end of the block and on top of the'block and a U-shaped clamppivoted to the sides of the block and provided with a toothed edge adapted to overlie the top of the block near the knife-edge end, and engage that portion of the tape which rests on top of the block.

3. An abrading tool consisting of a wedgeshaped apertured block, said blockbeing provided with a flat back and a substantially knifeedged front end, an abrasive tape located 'in the aperture in the block and extending downward-. ly along the back of the block and along its under face and about its front end and on the top of the block, a U-shaped clamp having legs pivoted to the side faces of the block adjacentthe frontend of the block, the legs on said clamp being connected by a toothed cross-bar adapted to engage the part of the tape located on top of the block to hold the same from shifting, and a similar clamp adapted to extend on the fiat back of. the block to engage the part of the tape located thereon.

4. An abrading tool consisting of, a wedgeshaped wooden block having a pointed front end and a relatively high back, an inclined curved upper surface on the block extending continuously from the back to the front, a cylindrical aperture extending through the block adjacent its rear end, a substantially wide slot located adjacent the upper end of the opening and extending from said opening through the back of the block, a roll of abrasive tape retained in the opening by virtue of its natural tendency to unroll therein, a part of said tape being bent sharply over the ends of the slot and closely following the back of the block so that the frictional engagement of said tape with the ends of the slot prevents inadvertent shifting of the tape through the slot, and a clamping element secured on the block and adapted to engage a part of the tape on top of the block adjacent the pointed end thereon.

5. An abrading tool consisting of, a wedgeshaped block having a cylindrical aperture extending through it near one of its ends, a slot extending from the aperture through the end adjacent which the aperture is located, a roll of abrasive tape located in the aperture and held therein by virtue of its natural tendency to unwind, said tape extending through the slot and passing along the bottom of the block and over the front thereof to reach the top of the block, and clamps pivoted to the block near its opposite ends to engage those parts of the tape which project from the roll and extend about the block.

6. An abrading tool consisting of a wooden block having a pointed terminal and a cylindrical aperture extending through it near its opposite end, a roll of abrasive tape located within the aperture and held therein by the natural tendency of the roll to unwind, a slot leading from the aperture to one end of the block, the opposite ends of said slot being formed with relatively sharp edges with the tape drawri from the roll and passed through the slot and angularly drawn over said edges whereby the inadvertent shifting of the tape through the slot is prevented by the frictional engagement of the tape with the edges, and clamping means for engaging the tape near its pointed end and holding it against the block.

HUGO WURFSCHMIDT. 

